Operating System (OS)
A program

is typically characterized by interactive processing and time of the CPU
is the device where information is stored
is a device that performs a sequence of operations specified by instructions in memory.
None of these
is a sequence of instructions

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Operating System (OS)
The term 'polling' in a computer means a process by which a computer system

multiplexes the inputs and updates the memory accordingly
inquires to see if a terminal has any transaction to send
None of these
decides correct alternative by analysing several ones
detects/corrects errors

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